U.S. patent number 11,314,367 [Application Number 17/152,701] was granted by the patent office on 2022-04-26 for digitizer and display device including the same.
This patent grant is currently assigned to Samsung Display Co., Ltd.. The grantee listed for this patent is Samsung Display Co., Ltd.. Invention is credited to Sung-Ki Jung.
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United States Patent |
11,314,367 |
Jung |
April 26, 2022 |
Digitizer and display device including the same
Abstract
A digitizer including a flexible printed circuit film including
a folding area configured to be folded, and having a first surface
and a second surface opposite to the first surface, a plurality of
first lines disposed on the first surface of the flexible printed
circuit film and extending in a first direction, and a plurality of
second lines disposed on the second surface of the flexible printed
circuit film and extending in a second direction crossing the first
direction, in which the first lines and the second lines define a
grid area overlapping the folding area on a plane, and the flexible
printed circuit film includes a penetration hole in the grid
area.
Inventors: |
Jung; Sung-Ki (Asan-si,
KR) |
Applicant: |
Name |
City |
State |
Country |
Type |
Samsung Display Co., Ltd. |
Yongin-si |
N/A |
KR |
|
|
Assignee: |
Samsung Display Co., Ltd.
(Yongin-si, KR)
|
Family
ID: |
1000006264207 |
Appl.
No.: |
17/152,701 |
Filed: |
January 19, 2021 |
Prior Publication Data
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|
|
Document
Identifier |
Publication Date |
|
US 20210333944 A1 |
Oct 28, 2021 |
|
Foreign Application Priority Data
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|
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Apr 28, 2020 [KR] |
|
|
10-2020-0051395 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H05K
1/028 (20130101); G06F 3/0446 (20190501); H05K
1/0296 (20130101); H01L 27/323 (20130101); H01L
27/3244 (20130101); H01L 51/5253 (20130101); H01L
51/0097 (20130101); H05K 2201/10128 (20130101); H01L
2251/5338 (20130101); G06F 2203/04102 (20130101) |
Current International
Class: |
G06F
3/044 (20060101); H01L 51/52 (20060101); H05K
1/02 (20060101); H01L 27/32 (20060101); H01L
51/00 (20060101) |
Field of
Search: |
;345/174 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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|
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10-2015-0007632 |
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Jan 2015 |
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KR |
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10-2016-0144912 |
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Dec 2016 |
|
KR |
|
10-1687158 |
|
Dec 2016 |
|
KR |
|
10-1749861 |
|
Jun 2017 |
|
KR |
|
10-1910111 |
|
Oct 2018 |
|
KR |
|
10-1986762 |
|
Jun 2019 |
|
KR |
|
Primary Examiner: Nguyen; Jimmy H
Attorney, Agent or Firm: H.C. Park & Associates, PLC
Claims
What is claimed is:
1. A digitizer comprising: a flexible printed circuit film
including a folding area configured to be folded, and having a
first surface and a second surface opposite to the first surface; a
plurality of first lines disposed on the first surface of the
flexible printed circuit film and extending in a first direction;
and a plurality of second lines disposed on the second surface of
the flexible printed circuit film and extending in a second
direction crossing the first direction, wherein: the first lines
and the second lines define a grid area overlapping the folding
area on a plane; and the flexible printed circuit film includes a
penetration hole in the grid area.
2. The digitizer of claim 1, wherein the penetration hole has
substantially a rectangular shape on a plane.
3. The digitizer of claim 1, further comprising a first step
compensation layer disposed on the first surface of the flexible
printed circuit film and covering the penetration hole.
4. The digitizer of claim 3, further comprising a filling member
disposed inside of the penetration hole.
5. The digitizer of claim 4, wherein the filling member includes at
least one of polyurethane, thermoplastic polyurethane, latex,
acrylic resin, polyurethane foam, and polystyrene foam.
6. The digitizer of claim 4, wherein the first step compensation
layer includes substantially the same material as the filling
member.
7. The digitizer of claim 3, wherein the first step compensation
layer includes an adhesive.
8. The digitizer of claim 7, wherein the adhesive includes at least
one of an optically transparent adhesive, an optically transparent
resin, and a pressure-sensitive adhesive.
9. The digitizer of claim 3, wherein the first compensation layer
further covers the first lines.
10. The digitizer of claim 3, further comprising a second
compensation layer disposed on the second surface of the flexible
printed circuit film and covering the penetration hole.
11. The digitizer of claim 1, wherein the penetration hole
includes: a first penetration hole having substantially a U-shape
on a plane; and a second penetration hole having a shape
substantially symmetrical to the first penetration hole with
respect to a center of the grid area.
12. A display device comprising: a display panel including a
substrate and a display structure disposed on the substrate; and a
digitizer disposed under the display panel, the digitizer
including: a flexible printed circuit film including a folding area
configured to be folded; a plurality of first lines disposed on the
flexible printed circuit film and extending in a first direction;
and a plurality of second lines disposed under the flexible printed
circuit film and extending in a second direction crossing the first
direction, wherein: the first lines and the second lines define a
grid area overlapping the folding area on a plane; and the flexible
printed circuit film includes a penetration hole in the grid
area.
13. The display device of claim 12, wherein the penetration hole
has substantially a rectangular shape on a plane.
14. The display device of claim 12, wherein the digitizer further
includes a first step compensation layer disposed on a first
surface of the flexible printed circuit film and covering the
penetration hole.
15. The display device of claim 14, wherein the digitizer further
includes a filling member disposed inside of the penetration
hole.
16. The display device of claim 15, wherein the first step
compensation layer includes substantially the same material as the
filling member.
17. The display device of claim 14, wherein the first step
compensation layer includes an adhesive.
18. The display device of claim 14, wherein the digitizer further
includes a second compensation layer disposed on a second surface
of the flexible printed circuit film and covering the penetration
hole.
19. The display device of claim 12, further comprising a touch
panel disposed on the display panel.
20. The display device of claim 12, further comprising: a
protection film disposed between the display panel and the
digitizer; a buffer member disposed between the protection film and
the digitizer; and a support member disposed under the digitizer
and including a plurality of slits in an area overlapping the
folding area.
Description
CROSS-REFERENCE TO RELATED APPLICATION
This application claims priority from and the benefit of Korean
Patent Application No. 10-2020-0051395, filed on Apr. 28, 2020,
which is hereby incorporated by reference for all purposes as if
fully set forth herein.
BACKGROUND
Field
Exemplary embodiments of the invention relate generally to a
digitizer and a display device including the digitizer and, more
specifically, to a digitizer with a penetration hole and the
display device including the digitizer.
Discussion of the Background
A display device may include at least one of a touch panel for
sensing a touch by a user's hand and a digitizer for sensing a
touch by an electromagnetic pen. The digitizer may be operated in
various ways, such as an electromagnetic resonance ("EMR") method,
a reduced pressure method, and a capacitance method. In the case of
the electromagnetic resonance method, touch coordinates may be
recognized by electromagnetic resonance between the digitizer and
the electromagnetic pen.
Recently, a demand for a foldable display device capable of folding
and unfolding the display device have been steadily increasing.
Accordingly, the digitizer may need to be adapted to the foldable
display device.
The above information disclosed in this Background section is only
for understanding of the background of the inventive concepts, and,
therefore, it may contain information that does not constitute
prior art.
SUMMARY
Digitizers and display devices including the same constructed
according to exemplary embodiments of the invention have a
penetration hole.
Additional features of the inventive concepts will be set forth in
the description which follows, and in part will be apparent from
the description, or may be learned by practice of the inventive
concepts.
A digitizer according to an exemplary embodiment includes a
flexible printed circuit film including a folding area configured
to be folded, and having a first surface and a second surface
opposite to the first surface, a plurality of first lines disposed
on the first surface of the flexible printed circuit film and
extending in a first direction, and a plurality of second lines
disposed on the second surface of the flexible printed circuit film
and extending in a second direction crossing the first direction,
in which the first lines and the second lines define a grid area
overlapping the folding area on a plane, and the flexible printed
circuit film includes a penetration hole in the grid area.
The penetration hole may have substantially a rectangular shape on
a plane.
The digitizer may further include a first step compensation layer
disposed on the first surface of the flexible printed circuit film
and covering the penetration hole.
The digitizer may further include a filling member disposed inside
of the penetration hole.
The filling member may include at least one of polyurethane,
thermoplastic polyurethane, latex, acrylic resin, polyurethane
foam, and polystyrene foam.
The first step compensation layer may include substantially the
same material as the filling member.
The first step compensation layer may include an adhesive.
The adhesive may include at least one of an optically transparent
adhesive, an optically transparent resin, and a pressure-sensitive
adhesive.
The first compensation layer may further cover the first lines.
The digitizer may further include a second compensation layer
disposed on the second surface of the flexible printed circuit film
and covering the penetration hole.
The penetration hole may include a first penetration hole having
substantially a U-shape on a plane, and a second penetration hole
having a shape substantially symmetrical to the first penetration
hole with respect to a center of the grid area.
A display device according to another exemplary embodiment includes
a display panel including a substrate and a display structure
disposed on the substrate, and a digitizer disposed under the
display panel, the digitizer including a flexible printed circuit
film including a folding area configured to be folded, a plurality
of first lines disposed on the flexible printed circuit film and
extending in a first direction, and a plurality of second lines
disposed under the flexible printed circuit film and extending in a
second direction crossing the first direction, in which the first
lines and the second lines may define a grid area overlapping the
folding area on a plane, and the flexible printed circuit film may
include a penetration hole in the grid area.
The penetration hole may have substantially a rectangular shape on
a plane.
The digitizer may further include a first step compensation layer
disposed on a first surface of the flexible printed circuit film
and covering the penetration hole.
The digitizer may further include a filling member disposed inside
of the penetration hole.
The first step compensation layer may include substantially the
same material as the filling member.
The first step compensation layer may include an adhesive.
The digitizer may further include a second compensation layer
disposed on a second surface of the flexible printed circuit film
and covering the penetration hole.
The display device may further include a touch panel disposed on
the display panel.
The display device may further include a protection film disposed
between the display panel and the digitizer, a buffer member
disposed between the protection film and the digitizer, and a
support member disposed under the digitizer and including a
plurality of slits in an area overlapping the folding area.
It is to be understood that both the foregoing general description
and the following detailed description are exemplary and
explanatory and are intended to provide further explanation of the
invention as claimed.
BRIEF DESCRIPTION OF THE DRAWINGS
The accompanying drawings, which are included to provide a further
understanding of the invention and are incorporated in and
constitute a part of this specification, illustrate exemplary
embodiments of the invention, and together with the description
serve to explain the inventive concepts.
FIG. 1 is a diagram illustrating a display device according to an
exemplarily embodiment.
FIG. 2 is a cross-sectional view taken along line I-I' of FIG.
1.
FIG. 3 is a plan view of a digitizer included in the display device
of FIG. 1 according to an exemplary embodiment.
FIG. 4 is a cross-sectional view taken along line II-II' of FIG.
3.
FIG. 5 is a cross-sectional view taken along line III-III' of FIG.
3.
FIG. 6 is a cross-sectional view taken along line IV-IV' of FIG.
3.
FIG. 7 is a plan view of a digitizer included in the display device
of FIG. 1 according to another exemplary embodiment.
FIG. 8 is a cross-sectional view taken along line V-V' of FIG.
7.
FIG. 9 is a cross-sectional view taken along line VI-VI' of FIG.
7.
FIG. 10 is a plan view of a digitizer included in the display
device of FIG. 1 according to another exemplary embodiment.
FIG. 11 is a cross-sectional view taken along line VII-VII' of FIG.
10.
FIG. 12 is a cross-sectional view taken along line VIII-VIII' of
FIG. 10.
FIG. 13 is a plan view of a digitizer included in the display
device of FIG. 1 according to another exemplary embodiment.
FIG. 14 is a plan view of a digitizer included in the display
device of FIG. 1 according to another exemplary embodiment.
DETAILED DESCRIPTION
In the following description, for the purposes of explanation,
numerous specific details are set forth in order to provide a
thorough understanding of various exemplary embodiments or
implementations of the invention. As used herein "embodiments" and
"implementations" are interchangeable words that are non-limiting
examples of devices or methods employing one or more of the
inventive concepts disclosed herein. It is apparent, however, that
various exemplary embodiments may be practiced without these
specific details or with one or more equivalent arrangements. In
other instances, well-known structures and devices are shown in
block diagram form in order to avoid unnecessarily obscuring
various exemplary embodiments. Further, various exemplary
embodiments may be different, but do not have to be exclusive. For
example, specific shapes, configurations, and characteristics of an
exemplary embodiment may be used or implemented in another
exemplary embodiment without departing from the inventive
concepts.
Unless otherwise specified, the illustrated exemplary embodiments
are to be understood as providing exemplary features of varying
detail of some ways in which the inventive concepts may be
implemented in practice. Therefore, unless otherwise specified, the
features, components, modules, layers, films, panels, regions,
and/or aspects, etc. (hereinafter individually or collectively
referred to as "elements"), of the various embodiments may be
otherwise combined, separated, interchanged, and/or rearranged
without departing from the inventive concepts.
The use of cross-hatching and/or shading in the accompanying
drawings is generally provided to clarify boundaries between
adjacent elements. As such, neither the presence nor the absence of
cross-hatching or shading conveys or indicates any preference or
requirement for particular materials, material properties,
dimensions, proportions, commonalities between illustrated
elements, and/or any other characteristic, attribute, property,
etc., of the elements, unless specified. Further, in the
accompanying drawings, the size and relative sizes of elements may
be exaggerated for clarity and/or descriptive purposes. When an
exemplary embodiment may be implemented differently, a specific
process order may be performed differently from the described
order. For example, two consecutively described processes may be
performed substantially at the same time or performed in an order
opposite to the described order. Also, like reference numerals
denote like elements.
When an element, such as a layer, is referred to as being "on,"
"connected to," or "coupled to" another element or layer, it may be
directly on, connected to, or coupled to the other element or layer
or intervening elements or layers may be present. When, however, an
element or layer is referred to as being "directly on," "directly
connected to," or "directly coupled to" another element or layer,
there are no intervening elements or layers present. To this end,
the term "connected" may refer to physical, electrical, and/or
fluid connection, with or without intervening elements. Further,
the D1-axis, the D2-axis, and the D3-axis are not limited to three
axes of a rectangular coordinate system, such as the x, y, and
z-axes, and may be interpreted in a broader sense. For example, the
D1-axis, the D2-axis, and the D3-axis may be perpendicular to one
another, or may represent different directions that are not
perpendicular to one another. For the purposes of this disclosure,
"at least one of X, Y, and Z" and "at least one selected from the
group consisting of X, Y, and Z" may be construed as X only, Y
only, Z only, or any combination of two or more of X, Y, and Z,
such as, for instance, XYZ, XYY, YZ, and ZZ. As used herein, the
term "and/or" includes any and all combinations of one or more of
the associated listed items.
Although the terms "first," "second," etc. may be used herein to
describe various types of elements, these elements should not be
limited by these terms. These terms are used to distinguish one
element from another element. Thus, a first element discussed below
could be termed a second element without departing from the
teachings of the disclosure.
Spatially relative terms, such as "beneath," "below," "under,"
"lower," "above," "upper," "over," "higher," "side" (e.g., as in
"sidewall"), and the like, may be used herein for descriptive
purposes, and, thereby, to describe one elements relationship to
another element(s) as illustrated in the drawings. Spatially
relative terms are intended to encompass different orientations of
an apparatus in use, operation, and/or manufacture in addition to
the orientation depicted in the drawings. For example, if the
apparatus in the drawings is turned over, elements described as
"below" or "beneath" other elements or features would then be
oriented "above" the other elements or features. Thus, the
exemplary term "below" can encompass both an orientation of above
and below. Furthermore, the apparatus may be otherwise oriented
(e.g., rotated 90 degrees or at other orientations), and, as such,
the spatially relative descriptors used herein interpreted
accordingly.
The terminology used herein is for the purpose of describing
particular embodiments and is not intended to be limiting. As used
herein, the singular forms, "a," "an," and "the" are intended to
include the plural forms as well, unless the context clearly
indicates otherwise. Moreover, the terms "comprises," "comprising,"
"includes," and/or "including," when used in this specification,
specify the presence of stated features, integers, steps,
operations, elements, components, and/or groups thereof, but do not
preclude the presence or addition of one or more other features,
integers, steps, operations, elements, components, and/or groups
thereof. It is also noted that, as used herein, the terms
"substantially," "about," and other similar terms, are used as
terms of approximation and not as terms of degree, and, as such,
are utilized to account for inherent deviations in measured,
calculated, and/or provided values that would be recognized by one
of ordinary skill in the art.
Various exemplary embodiments are described herein with reference
to sectional and/or exploded illustrations that are schematic
illustrations of idealized exemplary embodiments and/or
intermediate structures. As such, variations from the shapes of the
illustrations as a result, for example, of manufacturing techniques
and/or tolerances, are to be expected. Thus, exemplary embodiments
disclosed herein should not necessarily be construed as limited to
the particular illustrated shapes of regions, but are to include
deviations in shapes that result from, for instance, manufacturing.
In this manner, regions illustrated in the drawings may be
schematic in nature and the shapes of these regions may not reflect
actual shapes of regions of a device and, as such, are not
necessarily intended to be limiting.
Unless otherwise defined, all terms (including technical and
scientific terms) used herein have the same meaning as commonly
understood by one of ordinary skill in the art to which this
disclosure is a part. Terms, such as those defined in commonly used
dictionaries, should be interpreted as having a meaning that is
consistent with their meaning in the context of the relevant art
and should not be interpreted in an idealized or overly formal
sense, unless expressly so defined herein.
FIG. 1 is a diagram illustrating a display device according to an
exemplary embodiment. FIG. 2 is a cross-sectional view taken along
line I-I' of FIG. 1.
Referring to FIGS. 1 and 2, the display device 1000 according to an
exemplary embodiment may be divided into an active area AA and an
inactive area NA. For example, as shown in FIG. 1, the display
device 1000 may be divided into the active area AA and the
non-active area NA surrounding the active area AA on a plane. A
digitizer 100 may be disposed in the active area AA. When an input
unit 2000 approaches the active area AA by a user, the input unit
2000 and the digitizer 100 may communicate with each other to
perform various input functions. For example, the input unit 2000
may be an electromagnetic pen.
In addition, the display device 1000 may be divided into a folding
area FA and a flat area PA. For example, as shown in FIG. 1, the
display device 1000 may be divided into the folding area FA and the
flat area PA adjacent to the folding area FA. The display device
1000 in the flat area PA may not be folded.
The folding area FA may be an area in which the display device 1000
may be folded and unfolded. The folding area FA and the active area
AA may overlap each other. Accordingly, even when the digitizer 100
approaches the folding area FA of the input unit 2000, the input
unit 2000 and the digitizer 100 may communicate with each other.
When the display device 1000 is folded, components (e.g., the
digitizer 100) of the display device 1000 overlapping the folding
area FA may be folded together.
The display device 1000 may include the digitizer 100, a buffer
member CPN, a protection film PTF, a display panel DPN, a touch
panel TPN, a window WIN, a support member MTL, and a bracket
BRC.
The digitizer 100 may communicate with the input unit 2000 and may
detect an approach of the input unit 2000. For example, the
digitizer 100 may be implemented in an electromagnetic resonance
("EMR") method, a reduced pressure method, a capacitance method, or
a combination thereof. Meanwhile, as a part of the digitizer 100
overlaps the folding area FA, when the display device 1000 is
folded, the digitizer 100 may be folded together. The digitizer 100
will be described in more detail below with reference to FIG.
3.
The buffer member CPN may be disposed on the digitizer 100. The
buffer member CPN may protect the display panel DPN by buffering an
external shock applied to the display panel DPN. For example, the
buffer member CPN may include a material capable of buffering by
containing air, such as a cushion and a sponge. In addition, in
order to facilitate folding and unfolding of the display panel DPN,
the buffer member CPN may include a flexible material. For example,
the buffer member CPN may include at least one of polyurethane,
thermoplastic polyurethane, latex, acrylic resin, polyurethane
foam, and polystyrene foam.
The protection film PTF may be disposed on the buffer member CPN.
The protection film PTF may prevent penetration of moisture and
oxygen from an outside and may absorb an external shock. In order
to implement a flexible display device, the display panel DPN may
include a plastic substrate SUB which is flexible, and the
protection film PTF may support the plastic substrate SUB.
In addition, the protection film PTF may overlap the folding area
FA. Accordingly, the protection film PTF may prevent the plastic
substrate SUB from being deformed in the folding area FA.
For example, the protection film PTF may be a plastic film, such as
polyethersulfone ("PS"), polyacrylate ("PAR"), polyetherimide
("PEI"), polyethylenenaphthalate ("PEN"), polyphenylene sulfide
("PPS"), polyarylate ("PA"), polycarbonate ("PC"), poly(arylene
ethersulfone)), polyethylene terephthalate ("PET"), polyimide
("PI"), and the like.
The display panel DPN may include the plastic substrate SUB and a
plurality of display structures DS disposed on the plastic
substrate SUB. The plastic substrate SUB may contact the protection
film PTF. Each of the display structures DS may include a plurality
of transistors and a light emitting diode disposed on the
transistors. In an exemplary embodiment, the light emitting diode
may be an organic light emitting diode. For example, the
transistors may transfer a driving current to the organic light
emitting diode, and the organic light emitting diode may emit light
by receiving the driving current.
The touch panel TPN may be disposed on the display panel DPN. In an
exemplary embodiment, the touch panel TPN may sense a touch by a
user's hand. The touch panel TPN may be implemented as a
pressure-sensitive method, a resistive method, a capacitive method,
an infrared method, an ultrasonic method, or a combination thereof.
For example, the touch panel TPN may include a plurality of
transmission electrodes and a plurality of reception electrodes.
The touch panel TPN may detect a user's touch by detecting a change
in capacitance inside the touch panel TPN due to the user's
touch.
The window WIN may be disposed on the touch panel TPN. The window
WIN may be a front surface of the display device 1000 and may
protect the display panel DPN and the touch panel TPN. In order to
implement a foldable display device, the window WIN may include
polymethyl methacrylate ("PMMA"), polyethylene terephtalate
("PET"), or the like.
The support member MTL may be disposed under the digitizer 100. The
support member MTL may support the display panel DPN. As such, the
support member MTL may include a material having rigidity. For
example, the support member MTL may include a metallic material,
such as INVAR.RTM., which is an alloy of nickel ("Ni") and iron
("Fe"), stainless steel ("SUS"), titanium ("Ti"), copper
("Cu").
In addition, the support member MTL may include a plurality of
slits SLT overlapping the folding area FA. Since the support member
MTL includes the slits SLT, the support member MTL may allow the
display panel DPN to be easily folded and unfolded repeatedly. In
addition, the slits SLT overlapping the folding area FA may prevent
wrinkles from occurring in an upper surface of the window WIN
overlapping the folding area FA.
The bracket BRC may be disposed on a lower surface of the support
member MTL. The bracket BRC may be disposed at the lowermost
portion of the display device 1000 to protect the display device
1000. For example, the bracket BRC may further cover a side surface
of the display device 1000. In addition, the bracket BRC may
include an opening overlapping the folding area FA.
FIG. 3 is a plan view of a digitizer included in the display device
of FIG. 1 according to an exemplary embodiment. FIG. 4 is a
cross-sectional view taken along line II-II' of FIG. 3. FIG. 5 is a
cross-sectional view taken along line III-III' of FIG. 3. FIG. 6 is
a cross-sectional view taken along line IV-IV' of FIG. 3.
Referring to FIGS. 1, 3, 4, 5, and 6, the digitizer 100 according
to an exemplary embodiment may include a flexible printed circuit
film 200, first lines 300, second lines 400, a filling member 500,
a first step compensation layer 600, and a second step compensation
layer 700.
The flexible printed circuit film 200 may include an insulating
material. For example, the flexible printed circuit film 200 may
include polyethersulfone ("PS"), polyacrylate ("PAR"),
polyetherimide ("PEI"), polyethylenenaphthalate ("PEN"),
polyphenylene Sulfide ("PPS"), polyarylate ("PA"), polycarbonate
("PC"), poly(arylene ethersulfone)), polyethylene terephthalate
("PET"), polyimide ("PI"), and the like. The flexible printed
circuit film 200 may prevent the first lines 300 and the second
lines 400 from directly contacting each other.
In an exemplary embodiment, the flexible printed circuit film 200
may be disposed in the folding area FA. For example, the flexible
printed circuit film 200 may be repeatedly folded and unfolded in
the folding area FA.
The first lines 300 may be disposed on a first surface (e.g., an
upper surface) of the flexible printed circuit film 200. For
example, the first lines 300 may include metal, an alloy, a metal
nitride, a conductive metal oxide, a transparent conductive
material, and the like. For example, the first lines 300 may
include at least one of gold ("Au"), silver ("Ag"), aluminum
("Al"), platinum ("Pt"), nickel ("Ni"), copper ("Cu"), titanium
("Ti"), palladium ("Pd"), magnesium ("Mg"), calcium ("Ca"), lithium
("Li"), chromium ("Cr"), tantalum ("Ta"), molybdenum ("Mo"),
scandium ("Sc"), neodymium ("Nd"), iridium ("Ir"), tungsten ("W"),
tungsten nitride ("WN.sub.x"), titanium nitride ("TiN.sub.x"),
tantalum nitride ("TaN.sub.x"), strontium ruthenium oxide
("SrRu.sub.xO.sub.y"), zinc oxide ("ZnO.sub.x"), indium tin oxide
("ITO"), tin oxide ("SnO.sub.x"), indium oxide ("InO.sub.x"),
gallium oxide ("GaO.sub.x"), indium zinc oxide ("IZO"), and an
alloy thereof.
In an exemplary embodiment, the first lines 300 may include first
to sixth upper lines 310, 320, 330, 340, 350, and 360. Each of the
first to sixth upper lines 310, 320, 330, 340, 350, and 360 may
extend in a first direction D1 and may be spaced apart in a second
direction D2 crossing the first direction D1. In addition, as shown
in FIG. 3, the first and sixth upper lines 310 and 360 may overlap
the flat area PA, and the second to fifth upper lines 320, 330,
340, and 350 may overlap the folding area FA.
For example, after a conductive plate including any one of the
described-above conductive materials is formed on the flexible
printed circuit film 200, the first to sixth upper lines 310, 320,
330, 340, 350, and 360 may be formed by etching the conductive
plate.
The second lines 400 may be disposed on a second surface (e.g., a
lower surface) opposite to the first surface of the flexible
printed circuit film 200. For example, the second lines 400 may
include metal, an alloy, a metal nitride, a conductive metal oxide,
a transparent conductive material, and the like.
In an exemplary embodiment, the second lines 400 may include first
to sixth lower lines 410, 420, 430, 440, 450, and 460. Each of the
first to sixth lower lines 410, 420, 430, 440, 450, and 460 may
extend in the second direction D2 and may be spaced apart in the
first direction D1. In addition, as shown in FIG. 3, a portion of
each of the first to sixth lower lines 410, 420, 430, 440, 450, and
460 may overlap the folding area FA, and the remaining portion of
each of the first to sixth lower lines 410, 420, 430, 440, 450, and
460 may overlap the flat area PA.
For example, after a conductive plate including any one of the
described-above conductive materials is formed under the flexible
printed circuit film 200, the first to sixth lower lines 410, 420,
430, 440, 450, and 460 may be formed by etching the conductive
plate.
In an exemplary embodiment, a plurality of grid areas may be
defined between the first lines 300 extending in the first
direction D1 and the second lines 400 extending in the second
direction D2, in the flexible printed circuit film 200. For
example, as shown in FIG. 3, a grid area MA of the grid areas may
be defined by the first upper line 310, the second upper line 320,
the first lower line 410, and the second lower line 420.
Accordingly, some of the grid areas may overlap the folding area
FA, and the rest of the grid areas may overlap the flat area
PA.
In an exemplary embodiment, a penetration hole H penetrating the
flexible printed circuit film 200 may be formed in the grid area
overlapping the folding area FA among the grid areas. For example,
the penetration hole H may be formed in each of grid areas
overlapping the folding area FA.
In an exemplary embodiment, as shown in FIG. 3, the penetration
hole H may have substantially a rectangular shape on a plane. For
example, the penetration hole H may be formed by irradiating a
laser onto the flexible printed circuit film 200.
As the digitizer 100 includes the flexible printed circuit film 200
in which the penetration hole H is formed, the digitizer 100 may
easily be folded and unfolded, and a display quality of the display
device 1000 may be improved.
In detail, when a flexible printed circuit film not formed with the
penetration hole H is folded by an external force, a repulsive
force applied in a direction opposite to the external force may be
applied to the flexible printed circuit film. Due to the repulsive
force, folding and unfolding of the flexible printed circuit film
may be difficult. In addition, a lifting phenomenon may occur in
the flexible printed circuit film overlapping the folding area FA,
and a pattern caused by the lifting phenomenon may be visually
recognized by a user through the window WIN.
However, since the flexible printed circuit film 200 according to
an exemplary embodiment includes the penetration hole H therein,
the repulsive force applied to the flexible printed circuit film
200 may be relatively weak when folded. Accordingly, folding and
unfolding of the flexible printed circuit film 200 may be easily
performed and the lifting phenomenon may be suppressed. In this
manner, the display quality of the display device 1000 may be
improved.
In an exemplary embodiment, the filling member 500 may fill an
inside of penetration hole H. For example, the filling member 500
may include a material for reducing the repulsive force. In an
exemplary embodiment, the filling member 500 may include
substantially the same material as the buffer member CPN. For
example, the filling member 500 may include at least one of
polyurethane, thermoplastic polyurethane, latex, acrylic resin,
polyurethane foam, and polystyrene foam.
The first step compensation layer 600 may be disposed on the first
surface of the flexible printed circuit film 200 and may cover the
penetration hole H. In addition, the first step compensation layer
600 may cover the first lines 300 together. Accordingly, the first
step compensation layer 600 may compensate for a step difference on
the first surface due to the penetration hole H and the first lines
300. In particular, the first step compensation layer 600 may cover
the penetration hole H and the first lines 300, and may provide a
substantially flat top surface.
The second step compensation layer 700 may be disposed on the
second surface of the flexible printed circuit film 200 and may
cover the penetration hole H. In addition, the second step
compensation layer 700 may cover the second lines 400 together.
Accordingly, the second step compensation layer 700 may compensate
for a step difference on the second surface due to the penetration
hole H and the second lines 400. In particular, the second step
compensation layer 700 may cover the penetration hole H and the
second lines 400, and may provide a substantially flat lower
surface.
In an exemplary embodiment, each of the first and second step
compensation layers 600 and 700 may include substantially the same
material as the filling member 500. For example, the filling member
500, the first step compensation layer 600, and the second step
compensation layer 700 may be integrally formed.
As the digitizer 100 includes first and second step compensation
layers 600 and 700 for flattening the upper and lower surfaces of
the digitizer 100, a pattern of the penetration hole H, the first
lines 300, and the second lines 400 may not be visually recognized
by the user through the window WIN. Accordingly, the display
quality of the display device 1000 may be further improved.
As shown in FIG. 6, the first lines 300 may be disposed on the
first surface of the flexible printed circuit film 200, and the
second lines 400 may be disposed on the second surface of the
flexible printed circuit film 200. The first lines 300 and the
second lines 400 may not contact each other by the flexible printed
circuit film 200 therebetween.
The input unit 2000 may include a resonance circuit having a
capacitor and a coil. For example, a magnetic field or an
electromagnetic field emitted from the input unit 2000 may affect a
capacitance formed between the first and second lines 300 and 400.
Accordingly, the digitizer 100 may detect a position where the
input unit 2000 is close to. In addition, the digitizer 100 may
generate a magnetic field or an electromagnetic field by a current
input to the first and second lines 300 and 400. The magnetic field
or the electromagnetic field emitted from the digitizer 100 may
affect the input unit 2000. Accordingly, the digitizer 100 and the
input unit 2000 may communicate with each other to perform various
input functions.
FIG. 7 is a plan view illustrating a digitizer included in the
display device of FIG. 1 according to another exemplary embodiment.
FIG. 8 is a cross-sectional view taken along line V-V' of FIG. 7.
FIG. 9 is a cross-sectional view taken along line VI-VI' of FIG.
7.
Referring to FIGS. 1, 7, 8, and 9, a digitizer 110 according to the
illustrated exemplary embodiment may include a flexible printed
circuit film 200, first lines 300, second lines 400, filling member
500, and a first step compensation layer 610, and a second step
compensation layer 710. The digitizer 110 according to the
illustrated exemplary embodiment is substantially the same as the
digitizer 100 described above, except for the first step
compensation layer 610 and the second step compensation layer 710.
As such, the first step compensation layer 610 and the second step
compensation layer 710 will be mainly described, and repeated
descriptions of the substantially the same elements will be
omitted.
In an exemplary embodiment, each of the first and second step
compensation layers 610 and 710 may include an adhesive. For
example, the adhesive may include at least one of an optically
transparent adhesive ("OCA"), an optically transparent resin
("OCR"), and a pressure sensitive adhesive ("PSA"). In particular,
the filling member 500 according to the illustrated exemplary
embodiment may include a thermoplastic polyurethane ("TPU"), and
each of the first and second step compensation layers 610 and 710
may include a pressure-sensitive adhesive ("PSA"). Accordingly, an
adhesion of the digitizer 110 may be improved, and a reliability of
the display device 1000 may be improved.
FIG. 10 is a plan view of a digitizer included in the display
device of FIG. 1 according to another exemplary embodiment. FIG. 11
is a cross-sectional view taken along line VII-VII' of FIG. 10.
FIG. 12 is a cross-sectional view taken along line VIII-VIII' of
FIG. 10.
Referring to FIGS. 1, 10, 11 and 12, the digitizer 120 according to
the illustrated exemplary embodiment may include a flexible printed
circuit film 220, first lines 300, and second lines 400. The
digitizer 120 according to the illustrated exemplary embodiment is
substantially the same as the digitizer 100 described above. In
particular, the first lines 300 and the second lines 400 of the
digitizer 120 are substantially the same as those of the digitizer
100 described above. As such, repeated descriptions and
configuration of substantially the same elements of the digitizer
will be omitted, and differences therebetween will be mainly
described.
In an exemplary embodiment, a first penetration hole H_1 and a
second penetration hole H_2 penetrating the flexible printed
circuit film 220 may be formed in the grid area overlapping the
folding area FA among the grid areas. For example, the first and
second penetration holes H_1 and H_2 may be formed in each of the
grid areas overlapping the folding area FA. As shown in FIG. 10,
the first penetration hole H_1 may have substantially a U-shape on
a plane, and the second penetration hole H_2 may have a shape
substantially symmetrical with that of the first penetration hole
H_1 with respect to a center of the grid area.
The size of each of the first and second penetration holes H_1 and
H_2 of the digitizer 120 may be less than a size of the penetration
hole H of the digitizer 100 having substantially a rectangular
shape on a plane. Accordingly, the digitizer 120 according to the
illustrated exemplary embodiment may not include the filling member
500, the first step compensation layer 600, and the second step
compensation layer 700 of the digitizer 100 described above.
Accordingly, an efficiency of a process for manufacturing the
digitizer 120 may be improved. However, the inventive concepts are
not limited thereto, and in some exemplary embodiments, the
digitizer 120 may include at least one of the filling member 500,
the first step compensation layer 600, and the second step
compensation layer 700 of the digitizer 100.
FIG. 13 is a plan view of a digitizer included in the display
device of FIG. 1 according to another exemplary embodiment.
Referring to FIGS. 1 and 13, the digitizer 130 may include a
flexible printed circuit film 230, first lines 300, and second
lines 400. The digitizer 130 according to the illustrated exemplary
embodiment is substantially the same as the digitizer 100 described
above. In particular, the first lines 300 and the second lines 400
of the digitizer 120 are substantially the same as those of the
digitizer 100 described above. As such, repeated descriptions and
configuration of substantially the same elements of the digitizer
130 will be omitted, and differences therebetween will be mainly
described.
In an exemplary embodiment, a first penetration hole H_1 and a
second penetration hole H_2 penetrating the flexible printed
circuit film 230 may be formed in the grid area overlapping the
folding area FA among the grid areas. For example, the first and
second penetration holes H_1 and H_2 may be formed in each of the
grid areas overlapping the folding area FA. As shown in FIG. 13,
the first penetration hole H_1 may have substantially a U-shape on
a plane, and the second penetration hole H_2 may have a shape
substantially symmetrical with that of the first penetration hole
H_1 with respect to a center of the grid area.
The size of each of the first and second penetration holes H_1 and
H_2 of the digitizer 130 may be less than a size of the penetration
hole H of the digitizer 100 having substantially a rectangular
shape on a plane. Accordingly, the digitizer 130 according to the
illustrated exemplary embodiment may not include the filling member
500, the first step compensation layer 600, and the second step
compensation layer 700 of the digitizer 100 described above.
Accordingly, an efficiency of a process for manufacturing the
digitizer 130 may be improved. However, the inventive concepts are
not limited thereto, and in some exemplary embodiments, the
digitizer 130 may include at least one of the filling member 500,
the first step compensation layer 600, and the second step
compensation layer 700 of the digitizer 100.
FIG. 14 is a plan view of a digitizer included in the display
device of FIG. 1 according to another exemplary embodiment.
Referring to FIGS. 1 and 14, the digitizer 140 may include a
flexible printed circuit film 240, first lines 300, and second
lines 400. The digitizer 140 according to the illustrated exemplary
embodiment is substantially the same as the digitizer 100 described
above. In particular, the first lines 300 and the second lines 400
of the digitizer 120 are substantially the same as those of the
digitizer 100 described above. As such, repeated descriptions and
configuration of substantially the same elements of the digitizer
140 will be omitted, and differences therebetween will be mainly
described.
In an exemplary embodiment, a penetration hole H penetrating the
flexible printed circuit film 240 may be formed in the grid area
overlapping the folding area FA among the grid areas. For example,
the penetration hole H may be formed in each of the grid areas
overlapping the folding area FA. As shown in FIG. 14, the
penetration hole H may have substantially a U-shape on a plane.
The size of each of the penetration hole H of the digitizer 140 may
be less than a size of the penetration hole H of the digitizer 100
having substantially a rectangular shape on a plane. Accordingly,
the digitizer 140 may not include the filling member 500, the first
step compensation layer 600, and the second step compensation layer
700 of the digitizer 100 described above. Accordingly, an
efficiency of a process for manufacturing the digitizer 140 may be
improved. However, the inventive concepts are not limited thereto,
and in some exemplary embodiments, the digitizer 140 may include at
least one of the filling member 500, the first step compensation
layer 600, and the second step compensation layer 700 of the
digitizer 100.
A digitizer according to exemplary embodiments include a flexible
printed circuit film penetrated by a penetration hole. As such, the
digitizer may relatively weaken a repulsive force applied to the
flexible printed circuit film. Accordingly, folding and unfolding
of the flexible printed circuit film may be easily performed, and a
lifting phenomenon of the flexible printed circuit film may be
suppressed, so that display quality of a display device including
the digitizer may be improved.
In addition, the digitizer according to one or more exemplary
embodiments includes first and second step compensation layers for
flattening upper and lower surfaces of the digitizer, so that a
step difference due to the penetration hole is not visually
recognized by a user. Accordingly, a display quality of the display
device may be further improved.
Although certain exemplary embodiments and implementations have
been described herein, other embodiments and modifications will be
apparent from this description. Accordingly, the inventive concepts
are not limited to such embodiments, but rather to the broader
scope of the appended claims and various obvious modifications and
equivalent arrangements as would be apparent to a person of
ordinary skill in the art.
* * * * *